Benteng Cổ Loa (bahasa Vietnam: Cổ Loa thành) merupakan pemukiman berbenteng penting dan situs arkeologi di distrikĐông Anh, Hanoi saat ini, kira-kira 17 kilometer di utara Hanoi, di dataran atas utara sungai Hong.[1] Berbagai peninggalan kebudayaan Phùng Nguyên dari Zaman Perunggu dan Dongson telah ditemukan di Cổ Loa, meskipun kemudian didirikan sebagai ibu kota Kerajaan Âu Lạc selama abad ke-III SM (sekitar 257 SM).[2] Tempat ini mungkin adalah pusat politik pertama dari peradaban Vietnam.[3] Dinding konsentris pemukiman penyerupai cangkang siput; memiliki tanggul luar seluas 600 hektare.[4]
^Ngô Sĩ Liên et al., Đại Việt Sử Ký Toàn Thư"An Dương Vương" quote: "王於是築城于越裳,廣千丈,盤旋如螺形故號螺城。" tr: "The King then built a citadel at Việt Thường, one-thousand-zhàng wide, whirling and swirling like the shape of a conch. Therefore, it was called Conch Citadel (Loa Thành)."
^Kiernan, Ben (2017). Việt Nam: a history from earliest time to the present. Oxford University Press. p. 34
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